Piston ring



F. NORTON PISTON RING Filed Jan. 29, 1924 ill.

attozueq Patented May 25, 1926.

FRED H. NoR'roN,

nseat 5a sra'rss a rear ral-ca:

or M'Anorins'rEn, CONNECTICUT.

rxs'ron nine.

imam filed January 29, 1924. Serial no. earn.

This invention relates to new and useful improvements in packing rings,

packing rings ticula-rly to piston BXPlOSlVQ and internal c and parused in ombustlon engines.

One object of the invention ifs to provide a piston packing ring which will effectively retain the pressure of the explosion against passage back of the pist passage of lubricant to her.

Furthermore, the ring lubricant along the wall engine, while at the properly distribute of the cylinder of the same time scraping off it cannot escape or pass the combustion chamber. A further object is to on, and also prevent the explosion chamis designed to the excess, so that the plston and enter erally grooved piston packing ring having one wall of the groove curved, and the contacting face of the ring to a perfect the curved face,

ring will Wear takes place on so formed that the fit before wear with the result that the lubricant will be properly distributed in-a thin film on the cylinder as the piston moves in also retain the lubrican wall, one direction, and t within the groove to provide a seal against the passage of gases or lubricant past the piston.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

In the drawing Figure 1 is an elevation of a piston ring made in accordance with the invention, and

partly in section. Figure 2 is an enlarged fragmentary sectional view of the ring when the ring is first placed in the piston and cylinder.

Figure 3 is an enlarg tional view showing properly worn wall.

Referring particularly to the ing drawing, 10 represe der wall, against which, of the piston ring 12 15 this ring being arranged the exterior wall of a piston, not

groove in ed fragmentary secthe ring after it has to it against the cylinder 'accompan nts an engine cylinthe contacting face arranged to engage, to be placed in a shown, but which will be readily understood.

' The ring consists of a body, rectangular in cross section, and being split and formed with peripheral face of the is formed with two por the step-lap joint 13.

The outer ring, or that portions 14 and 15, the

. narrow wall or face 17. provide a periphformer of -which is approximately twice wide as the latter, and between. these' poi tions there is formeda channel or groove 16,

Vvhen the ring is first placed in the piston groove, and the piston operated in the cylinder, the portion of the face 14, between its outer wall contacting part and the portion lying in the plane of the outer end of the curved portion, as well as an equal part of the thickness of the ring in the narrow face 15, will wear down to a perfect it to the wall of the cylinder, before it reaches the curved portion or wall of the groove.

In the operation of the ring, when the iston moves toward the compression end of its stroke, oil, which lies within the groove of the piston ring, will form a seal to prevent escape of gases past the piston, while at the same time said oil will roll on the curved wall of the groove, and against the cylinder wall, to spread a thin film thereon. The oil rolled from the convex face, onto the cylinder wall, is generally of too great volume for the efficient lubrication of the wall-and piston, and acts as a wedge to contract the ring, with the result that certain portion of the oil will be blown into the combustion chamber. To obviate this, the short oblique portion 11', of the wall of the groove,serves to cut. or reduce the thickness of this film of oil to such a degree that none of such film of oil will be blown into the combustion chamber. Furthermore, the excess, shaved off by the sharp edgeformed at the junction of the excess oil from the cylinder of the narrow face portion 15 and the adjacent wall of the groove 16 Will scrape the Wall, and carry same Within the groove, to the other end of the piston stroke. Thus the compression Will be efl ectively held up, While at the same time the oil Will be held down. This Will result in more perfect combustion above the piston, and maintain the terminals of the spark plugs in a clean condition, because of the fact that no oil Will gain access to the combustion chamber to cause deposit of carbon on the electrodes of the plugs.

lVhat is claimed is:

A piston ring having a circumscribing groove in its cylinder contacting face, said groove having side and bottom walls one side vall of the groove having a convex portion originating at the bottom wall of the groove and terminating inwardly of the cylinder contacting face of the ring, and an oblique portion extending from the outer terminus of the convex portion and meeting the said cylinder contacting face at an obtuse angle, that portion of the cylinder contacting face of the ring including the oblique portion being adapted to initially distribute oil on the cylinder Wall and to be subsequently worn away.

In testimony whereof, I afiix my signature.

' FRED H. N OREON 

